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Created attachment 77358 [details] The ant file to reproduce the error Build ID: I20070625-1500 Steps To Reproduce: 1. Starting eclipse 2. Opening Ant editor on build.xml (attached) --> works! 3. (Un)commenting some lines in section "<macrodef name="properties">" of the file until 4. Syntax highlighting of comments and non comments is intermingled (which is an error in itself) 5. Closing the Ant editor 6. Try and reopen the Ant editor. This fails saying: "Error opening the editor." And looking at the "Details" shows the following exception: java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(Unknown Source) at org.apache.tools.ant.util.JAXPUtils.newSAXParser(JAXPUtils.java:215) at org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.java:172) at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:185) at org.apache.tools.ant.helper.ProjectHelper2.parseUnknownElement(ProjectHelper2.java:86) at org.apache.tools.ant.taskdefs.Antlib.createAntlib(Antlib.java:75) at org.apache.tools.ant.taskdefs.Definer.loadAntlib(Definer.java:429) at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:281) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at org.eclipse.ant.internal.ui.model.AntDefiningTaskNode.configure(AntDefiningTaskNode.java:86) at org.eclipse.ant.internal.ui.model.AntModel.resolveBuildfile(AntModel.java:504) at org.eclipse.ant.internal.ui.model.AntModel.parseDocument(AntModel.java:329) at org.eclipse.ant.internal.ui.model.AntModel.reconcile(AntModel.java:265) at org.eclipse.ant.internal.ui.model.AntModel.getProjectNode(AntModel.java:1386) at org.eclipse.ant.internal.ui.model.AntModel.getProjectNode(AntModel.java:1396) at org.eclipse.ant.internal.ui.editor.text.AntFoldingStructureProvider.updateFoldingRegions(AntFoldingStructureProvider.java:88) at org.eclipse.ant.internal.ui.editor.AntEditor.projectionEnabled(AntEditor.java:1210) at org.eclipse.jface.text.source.projection.ProjectionViewer.fireProjectionEnabled(ProjectionViewer.java:481) at org.eclipse.jface.text.source.projection.ProjectionViewer.enableProjection(ProjectionViewer.java:529) at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1419) at org.eclipse.ant.internal.ui.editor.AntEditor$StatusLineSourceViewer.doOperation(AntEditor.java:213) at org.eclipse.ant.internal.ui.editor.AntEditor.createPartControl(AntEditor.java:944) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592) at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:263) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2721) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2633) at org.eclipse.ui.internal.WorkbenchPage.access$12(WorkbenchPage.java:2625) at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2577) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2572) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2556) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2547) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:644) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:603) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:285) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:138) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:194) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:175) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:268) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:244) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:316) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:613) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:857) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:46) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:193) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818) at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079) at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183) at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263) at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:297) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219) at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:153) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:504) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443) at org.eclipse.equinox.launcher.Main.run(Main.java:1169) at org.eclipse.equinox.launcher.Main.main(Main.java:1144) 7. After restarting eclipse the editor can be opened again and you can replay this bug scenario from step one... More information: ...ask me
Thank you for the bug report. Workarounds listed https://bugs.eclipse.org/bugs/show_bug.cgi?id=143008#c6 *** This bug has been marked as a duplicate of bug 152793 ***
